Crossword Genius

Irrational clue found in abyss (10,3)

Ross

I believe the answer is:

bottomless pit

I'm a little stuck... Click here to teach me more about this clue!

'abyss' is the definition.
(I've seen this in another clue)

'irrational clue' is the wordplay.
I cannot quite see how this works, but
'irrational' could be 'pi' (an irrational number) and 'pi' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

'found in' is the link.

Can you help me to learn more?

(Other definitions for bottomless pit that I've seen before include "nether regions - with 7a" , "place needing it eternally" , "Source of infinite fuel" .)

I've seen this clue in The Independent.
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